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Prev Professional Automotive Repair Technical Discussions for March 13, 2012
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Open Help Requests for GM
Help Request Answers
1992 Buick Roadmaster 5.7L Poor Idle Quality, Surge, High Idle VIN: 1G4BR837XN
This older tbi gem isn't something we see everyday and I feel were caught up with something simple were missing. The customer came in with a high idle complaint. The vehicle idles up over 1500 when cold. After warmed it drops to the 1100 to 1200 range. We gave... Trouble codes: 24 (No Vehicle Speed Signal Recieved)
2011 Cadillac Escalade 6.2L fuel VIN: 3GYT4NEF3B
This truck fails only on first start in morning, here my country min temperature is around 60F, the car start and stall exacly two times, on the third crank stays running quite unstable and in a very lean condition, if its accelerated you hear the explosion in...
2001 Chevrolet Silverado 2500 HD 6.6L Hesitation, Surge, MIL Lamp on VIN: 1GCHK23151
Hello to all, and thanks in advance. As my repair history states, engine was replaced with lower mileage unit and problem was there before and after. It fails to start without either. And under hard accel it sets code P0094 for fuel leak and Ive seen the desir... Trouble codes: P0094 (Fuel system small leak detected)
2003 Chevrolet Trailblazer LTZ 4.2L Stall, Strains on acc. VIN: 1GNDS13SX3
Vehicle starts and idles good. Problem is straining on acceleration, from take of on moderate acc. or at highway speed if trying to gain speed faster or on pulls, even if cruise is on and going up a slight grade.Scanned sys. no codes present. After driving app... Trouble codes: P0172
2003 Chevrolet Trailblazer LTZ 4.2L Hesitation VIN: 1GNDS13SX3
Sys. has code PO172B, fuel trim sys, code will reset after app. 10 miles driving from cold start to the 10 miles. Fuel pressure great, convertor appears to be clear, replaced front o2 sensor. Cleared codes, reroadtested same code reset after app. 10 miles. Idl... Trouble codes: P0172
2004 Chevrolet Classic 2.2L Bcm Warning Lights VIN: 1G1ND52F74
Need some help on this one guys! Car came in with a steering problem, rack was rotted loose from the cradle. Replaced cradle and sent vehicle out for alignment. got vehicle back and proceeded to check for inspection. Found horn not working. installed push butt...
2008 Chevrolet Express 1500 5.3L runs great no codes VIN: 1GCFG15438
HI, This Chevrolet Express Van 1500 is due for Inspection here in NY. It had an EVAP code P0449, it was repaired at another shop and the code was erased. They have driven the van aprox. 1000 miles and the monitors won't run. I personally drove it almost 100 mi...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP54K83
Threw up my hands on this one, checked all the items noted and finally sent it to the dealer. I talked to the service manager and he said the MAP and MAF were dropping out and they replaced them and it has been good so far. I had graphed them and thought they ...
2001 Cadillac Seville STS 4.6L Poor Idle Quality VIN: 1G6KY54971
Thank you to everyone that took the time to reply. I checked the EGR and TPS for proper operation and they were operating as designed. Also the lower gaskets on the plenum are new from when I replaced the intake boot. Checked IAC connector and pin fit, OK. I ... Trouble codes: P0507.
1996 Chevrolet Cavalier 2.2L Stall VIN: 1G1JC1242T
We got it to stall with fuel gauge hooked up, it maintained fuel pressure. It had spark and injector pulse when it wouldnt restart. We thought maybe the spark was incorrect so we repalced the ignition module and it still stalled. We thought it might need a com...
1999 Chevrolet Malibu LS 3.1L MIL Lamp on VIN: 1G1NE52J1X
I would sincerly like to thank everyone who replied, There was a lot of great tech info given, I had replaced the map and maf sensors with known good ones and no change. I decided to volunteer my labor at nc and replaced the intake gaskets, while replacing the... Trouble codes: P1433.
2004 Chevrolet Silverado 1500 4.8L Intermittently Not VIN: 1GCEK14V34
Twofold failure on this one. The cluster was definitely faulty, we tested inputs to cluster when it was failing and they were good, communication was present when cluster was working, not when it was failing, could communicate with all other modules. Replaced ...
2007 Chevrolet Tahoe LTZ 5.3L Misfire VIN: 1GNFK13067
I'd like to thank everyone for their time and advice.Taking everyones advice I replaced VLOM solenoid assy and all the lifters and truck runs like new.The cylinder 6 intake lifter was dead like suspected.Thanks again. Trouble codes: P0300, P0306.
2009 Chevrolet Express 1500 5.3L ipc VIN: 1GCFH15409
all wiring between VSS, TCM, ECM, BCM,& IPC was all good. Had correct Hz signals, still intermittantly speedo and trans range indicator would drop out. Replaced TCM and reflashed all ok runs great no issues.
2006 GMC Envoy SLT 4.2L drivers door control module VIN: 1GKDT13S96
Thanks to everyone on their responses. It was a programming issue. I appreciate the education.
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